The top selling Mac in many online stores is the thirteen inch MacBook Pro. It is a small, cheap and reliable Mac due to its aluminum enclosure and build quality. It is often a good choice to buy the computer on MacMall or Amazon. They are usually cheaper compared to the Apple Store.
Apple 13.3″ MacBook Pro dual-core Intel Core i5 2.5GHz, 4GB RAM, 500GB 5400-rpm hard drive, Intel HD Graphics 4000, Ships with Mountain Lion (MD101LL/A)